Patents by Inventor Alexander Robertson Craig

Alexander Robertson Craig has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Marking metal
    Patent number: 4066807
    Abstract: In the marking of metal, for example, steel billets, by spraying aluminum through a stencil, the sprayed metal tends to build up on the stencil and render it inoperative. To reduce the metal build-up, a release compound is applied to the stencil surface and the surface is cleaned periodically during use. The release compound can be sprayed-on and cleaning can be effected by a rotary brush, both movable with the metal spray nozzle.
    Type: Grant
    Filed: February 17, 1976
    Date of Patent: January 3, 1978
    Assignee: Hilti Aktiengesellschaft
    Inventor: Alexander Robertson Craig